Skip the auto shop - Our mechanics make house calls

Q: My new turbo leaking from the bottom exhaust side.

asked by on

I have replaced my faulty turbo with a new genuine one. It leaks now on the outside underneath on the exhuast side. Only a little. I took the oil return hose from the turbo off at the sump. When I start the car oil comes out of the sump and stops when I turn the car off. Why would oil come out the sump where the turbo return hose goes. Oil is not over full. 1999 nissan patrol 2.8 turbo diesel

My car has 243000 miles.
My car has a manual transmission.

A: Hi - there are several possibilities for oi...

Hi - there are several possibilities for oil coming out of the sump. While the engine is operating, there is considerable pressure inside the crankcase from all the rotating parts thrashing oil around. Worn piston rings, especially on a turbo diesel engine with higher compression than a gas engine will create higher crankcase pressures. Even though the return line has some pressure, the crankcase pressure offers enough resistance or pressure of its own to overcome the leaky fitting, forcing oil out. Best to get the leaky fitting issue resolved, and the problem should disappear. Make sure crankcase breather valves (PCV) and hoses are clear and venting properly. I would recommend having a oil/fluid leak inspection completed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost for repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Heavy transmission leak.

The transmission needs to be inspected to determine the source of the leak. If the leak source is not obviously identified, Nissan has a TSB out NTB09-140 which discusses the proper diagnosis using a UV dye to locate hard to...

Q: Brakes locking up

You need to recheck the brake light switch installation. If it is adjusted incorrectly it could partly hold the brakes engaged and would lock up the brakes or keep them partly engaged. The light switch should not be bottomed out...

Q: Rebuilding transmission on a '94 Nissan Sentra

If it doesn't burn much oil, runs good, and is not a rust bucket like up North where everything is rust, then sure why not. My advice is that you are often better buying a remanufactured transmission factory remade and...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...